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                    可变参数
            
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                    Recover捕获异常
            
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                    方法
            
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                    方法声明
            
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                    基于指针对象的方法
            
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                    通过嵌入结构体来扩展类型
            
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                    方法值和方法表达式
            
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                    示例: Bit数组
            
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                    封装
            
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                    接口
            
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                    接口是合约
            
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                    接口类型
            
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                    实现接口的条件
            
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                    flag.Value接口
            
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                    接口值
            
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                    sort.Interface接口
            
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                    http.Handler接口
            
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                    error接口
            
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                    示例: 表达式求值
            
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                    类型断言
            
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                    基于类型断言识别错误类型
            
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                    通过类型断言查询接口
            
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                    类型分支
            
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                    示例: 基于标记的XML解码
            
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                    补充几点
            
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        <li class="chapter " data-level="1.9" data-path="../ch8/ch8.html">
            
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                    Goroutines和Channels
            
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                    Goroutines
            
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                    示例: 并发的Clock服务
            
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        <li class="chapter " data-level="1.9.3" data-path="../ch8/ch8-03.html">
            
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                    示例: 并发的Echo服务
            
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                    Channels
            
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        <li class="chapter " data-level="1.9.5" data-path="../ch8/ch8-05.html">
            
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                    并发的循环
            
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                    示例: 并发的Web爬虫
            
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        <li class="chapter " data-level="1.9.7" data-path="../ch8/ch8-07.html">
            
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                    基于select的多路复用
            
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                    示例: 并发的目录遍历
            
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                    并发的退出
            
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                    示例: 聊天服务
            
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        <li class="chapter " data-level="1.10" data-path="../ch9/ch9.html">
            
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                    基于共享变量的并发
            
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                    竞争条件
            
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        <li class="chapter " data-level="1.10.2" data-path="../ch9/ch9-02.html">
            
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                    sync.Mutex互斥锁
            
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        <li class="chapter " data-level="1.10.3" data-path="../ch9/ch9-03.html">
            
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                    sync.RWMutex读写锁
            
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                    内存同步
            
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                    sync.Once惰性初始化
            
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        <li class="chapter " data-level="1.10.6" data-path="../ch9/ch9-06.html">
            
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                    竞争条件检测
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.7" data-path="../ch9/ch9-07.html">
            
                <a href="../ch9/ch9-07.html">
            
                    
                    示例: 并发的非阻塞缓存
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.8" data-path="../ch9/ch9-08.html">
            
                <a href="../ch9/ch9-08.html">
            
                    
                    Goroutines和线程
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.11" data-path="../ch10/ch10.html">
            
                <a href="../ch10/ch10.html">
            
                    
                    包和工具
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.11.1" data-path="../ch10/ch10-01.html">
            
                <a href="../ch10/ch10-01.html">
            
                    
                    包简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.2" data-path="../ch10/ch10-02.html">
            
                <a href="../ch10/ch10-02.html">
            
                    
                    导入路径
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.3" data-path="../ch10/ch10-03.html">
            
                <a href="../ch10/ch10-03.html">
            
                    
                    包声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.4" data-path="../ch10/ch10-04.html">
            
                <a href="../ch10/ch10-04.html">
            
                    
                    导入声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.5" data-path="../ch10/ch10-05.html">
            
                <a href="../ch10/ch10-05.html">
            
                    
                    包的匿名导入
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.6" data-path="../ch10/ch10-06.html">
            
                <a href="../ch10/ch10-06.html">
            
                    
                    包和命名
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.7" data-path="../ch10/ch10-07.html">
            
                <a href="../ch10/ch10-07.html">
            
                    
                    工具
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.12" data-path="../ch11/ch11.html">
            
                <a href="../ch11/ch11.html">
            
                    
                    测试
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.12.1" data-path="../ch11/ch11-01.html">
            
                <a href="../ch11/ch11-01.html">
            
                    
                    go test
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.2" data-path="../ch11/ch11-02.html">
            
                <a href="../ch11/ch11-02.html">
            
                    
                    测试函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.3" data-path="../ch11/ch11-03.html">
            
                <a href="../ch11/ch11-03.html">
            
                    
                    测试覆盖率
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.4" data-path="../ch11/ch11-04.html">
            
                <a href="../ch11/ch11-04.html">
            
                    
                    基准测试
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.5" data-path="../ch11/ch11-05.html">
            
                <a href="../ch11/ch11-05.html">
            
                    
                    剖析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.6" data-path="../ch11/ch11-06.html">
            
                <a href="../ch11/ch11-06.html">
            
                    
                    示例函数
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.13" data-path="../ch12/ch12.html">
            
                <a href="../ch12/ch12.html">
            
                    
                    反射
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.13.1" data-path="../ch12/ch12-01.html">
            
                <a href="../ch12/ch12-01.html">
            
                    
                    为何需要反射?
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.2" data-path="../ch12/ch12-02.html">
            
                <a href="../ch12/ch12-02.html">
            
                    
                    reflect.Type和reflect.Value
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.3" data-path="../ch12/ch12-03.html">
            
                <a href="../ch12/ch12-03.html">
            
                    
                    Display递归打印
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.4" data-path="../ch12/ch12-04.html">
            
                <a href="../ch12/ch12-04.html">
            
                    
                    示例: 编码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.5" data-path="../ch12/ch12-05.html">
            
                <a href="../ch12/ch12-05.html">
            
                    
                    通过reflect.Value修改值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.6" data-path="../ch12/ch12-06.html">
            
                <a href="../ch12/ch12-06.html">
            
                    
                    示例: 解码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.7" data-path="../ch12/ch12-07.html">
            
                <a href="../ch12/ch12-07.html">
            
                    
                    获取结构体字段标签
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.8" data-path="../ch12/ch12-08.html">
            
                <a href="../ch12/ch12-08.html">
            
                    
                    显示一个类型的方法集
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.9" data-path="../ch12/ch12-09.html">
            
                <a href="../ch12/ch12-09.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.14" data-path="../ch13/ch13.html">
            
                <a href="../ch13/ch13.html">
            
                    
                    底层编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.14.1" data-path="../ch13/ch13-01.html">
            
                <a href="../ch13/ch13-01.html">
            
                    
                    unsafe.Sizeof, Alignof 和 Offsetof
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.2" data-path="../ch13/ch13-02.html">
            
                <a href="../ch13/ch13-02.html">
            
                    
                    unsafe.Pointer
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.3" data-path="../ch13/ch13-03.html">
            
                <a href="../ch13/ch13-03.html">
            
                    
                    示例: 深度相等判断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.4" data-path="../ch13/ch13-04.html">
            
                <a href="../ch13/ch13-04.html">
            
                    
                    通过cgo调用C代码
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.5" data-path="../ch13/ch13-05.html">
            
                <a href="../ch13/ch13-05.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.15" data-path="../appendix/appendix.html">
            
                <a href="../appendix/appendix.html">
            
                    
                    附录
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.15.1" data-path="../appendix/appendix-a-errata.html">
            
                <a href="../appendix/appendix-a-errata.html">
            
                    
                    附录A：原文勘误
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.2" data-path="../appendix/appendix-b-author.html">
            
                <a href="../appendix/appendix-b-author.html">
            
                    
                    附录B：作者译者
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.3" data-path="../appendix/appendix-c-cpoyright.html">
            
                <a href="../appendix/appendix-c-cpoyright.html">
            
                    
                    附录C：译文授权
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.4" data-path="../appendix/appendix-d-translations.html">
            
                <a href="../appendix/appendix-d-translations.html">
            
                    
                    附录D：其它语言
            
                </a>
            

            
        </li>
    

            </ul>
            
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    <h1>
        <i class="fa fa-circle-o-notch fa-spin"></i>
        <a href=".." >Hello, World</a>
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                                <h2 id="11-hello-world">1.1. Hello, World</h2>
<p>&#x6211;&#x4EEC;&#x4EE5;&#x73B0;&#x5DF2;&#x6210;&#x4E3A;&#x4F20;&#x7EDF;&#x7684;&#x201C;hello world&#x201D;&#x6848;&#x4F8B;&#x6765;&#x5F00;&#x59CB;&#x5427;&#xFF0C;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x9996;&#x6B21;&#x51FA;&#x73B0;&#x4E8E;1978&#x5E74;&#x51FA;&#x7248;&#x7684;C&#x8BED;&#x8A00;&#x5723;&#x7ECF;<a href="http://s3-us-west-2.amazonaws.com/belllabs-microsite-dritchie/cbook/index.html" target="_blank">&#x300A;The C Programming Language&#x300B;</a>&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x672C;&#x4E66;&#x4F5C;&#x8005;&#x4E4B;&#x4E00;Brian W. Kernighan&#x4E5F;&#x662F;&#x300A;The C Programming Language&#x300B;&#x4E00;&#x4E66;&#x7684;&#x4F5C;&#x8005;&#xFF09;&#x3002;C&#x8BED;&#x8A00;&#x662F;&#x76F4;&#x63A5;&#x5F71;&#x54CD;Go&#x8BED;&#x8A00;&#x8BBE;&#x8BA1;&#x7684;&#x8BED;&#x8A00;&#x4E4B;&#x4E00;&#x3002;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x4F53;&#x73B0;&#x4E86;Go&#x8BED;&#x8A00;&#x4E00;&#x4E9B;&#x6838;&#x5FC3;&#x7406;&#x5FF5;&#x3002;</p>
<p><u><i>gopl.io/ch1/helloworld</i></u></p>
<pre><code class="lang-go"><span class="hljs-keyword">package</span> main

<span class="hljs-keyword">import</span> <span class="hljs-string">&quot;fmt&quot;</span>

<span class="hljs-keyword">func</span> main() {
    fmt.Println(<span class="hljs-string">&quot;Hello, &#x4E16;&#x754C;&quot;</span>)
}
</code></pre>
<p>Go&#x662F;&#x4E00;&#x95E8;&#x7F16;&#x8BD1;&#x578B;&#x8BED;&#x8A00;&#xFF0C;Go&#x8BED;&#x8A00;&#x7684;&#x5DE5;&#x5177;&#x94FE;&#x5C06;&#x6E90;&#x4EE3;&#x7801;&#x53CA;&#x5176;&#x4F9D;&#x8D56;&#x8F6C;&#x6362;&#x6210;&#x8BA1;&#x7B97;&#x673A;&#x7684;&#x673A;&#x5668;&#x6307;&#x4EE4;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x9759;&#x6001;&#x7F16;&#x8BD1;&#xFF09;&#x3002;Go&#x8BED;&#x8A00;&#x63D0;&#x4F9B;&#x7684;&#x5DE5;&#x5177;&#x90FD;&#x901A;&#x8FC7;&#x4E00;&#x4E2A;&#x5355;&#x72EC;&#x7684;&#x547D;&#x4EE4;<code>go</code>&#x8C03;&#x7528;&#xFF0C;<code>go</code>&#x547D;&#x4EE4;&#x6709;&#x4E00;&#x7CFB;&#x5217;&#x5B50;&#x547D;&#x4EE4;&#x3002;&#x6700;&#x7B80;&#x5355;&#x7684;&#x4E00;&#x4E2A;&#x5B50;&#x547D;&#x4EE4;&#x5C31;&#x662F;run&#x3002;&#x8FD9;&#x4E2A;&#x547D;&#x4EE4;&#x7F16;&#x8BD1;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x4EE5;.go&#x7ED3;&#x5C3E;&#x7684;&#x6E90;&#x6587;&#x4EF6;&#xFF0C;&#x94FE;&#x63A5;&#x5E93;&#x6587;&#x4EF6;&#xFF0C;&#x5E76;&#x8FD0;&#x884C;&#x6700;&#x7EC8;&#x751F;&#x6210;&#x7684;&#x53EF;&#x6267;&#x884C;&#x6587;&#x4EF6;&#x3002;&#xFF08;&#x672C;&#x4E66;&#x4F7F;&#x7528;$&#x8868;&#x793A;&#x547D;&#x4EE4;&#x884C;&#x63D0;&#x793A;&#x7B26;&#x3002;&#xFF09;</p>
<pre><code>$ go run helloworld.go
</code></pre><p>&#x6BEB;&#x65E0;&#x610F;&#x5916;&#xFF0C;&#x8FD9;&#x4E2A;&#x547D;&#x4EE4;&#x4F1A;&#x8F93;&#x51FA;&#xFF1A;</p>
<pre><code>Hello, &#x4E16;&#x754C;
</code></pre><p>Go&#x8BED;&#x8A00;&#x539F;&#x751F;&#x652F;&#x6301;Unicode&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x5904;&#x7406;&#x5168;&#x4E16;&#x754C;&#x4EFB;&#x4F55;&#x8BED;&#x8A00;&#x7684;&#x6587;&#x672C;&#x3002;</p>
<p>&#x5982;&#x679C;&#x4E0D;&#x53EA;&#x662F;&#x4E00;&#x6B21;&#x6027;&#x5B9E;&#x9A8C;&#xFF0C;&#x4F60;&#x80AF;&#x5B9A;&#x5E0C;&#x671B;&#x80FD;&#x591F;&#x7F16;&#x8BD1;&#x8FD9;&#x4E2A;&#x7A0B;&#x5E8F;&#xFF0C;&#x4FDD;&#x5B58;&#x7F16;&#x8BD1;&#x7ED3;&#x679C;&#x4EE5;&#x5907;&#x5C06;&#x6765;&#x4E4B;&#x7528;&#x3002;&#x53EF;&#x4EE5;&#x7528;build&#x5B50;&#x547D;&#x4EE4;&#xFF1A;</p>
<pre><code>$ go build helloworld.go
</code></pre><p>&#x8FD9;&#x4E2A;&#x547D;&#x4EE4;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x540D;&#x4E3A;helloworld&#x7684;&#x53EF;&#x6267;&#x884C;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x6587;&#x4EF6;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;Windows&#x7CFB;&#x7EDF;&#x4E0B;&#x751F;&#x6210;&#x7684;&#x53EF;&#x6267;&#x884C;&#x6587;&#x4EF6;&#x662F;helloworld.exe&#xFF0C;&#x589E;&#x52A0;&#x4E86;.exe&#x540E;&#x7F00;&#x540D;&#xFF09;&#xFF0C;&#x4E4B;&#x540E;&#x4F60;&#x53EF;&#x4EE5;&#x968F;&#x65F6;&#x8FD0;&#x884C;&#x5B83;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x5728;Windows&#x7CFB;&#x7EDF;&#x4E0B;&#x5728;&#x547D;&#x4EE4;&#x884C;&#x76F4;&#x63A5;&#x8F93;&#x5165;helloworld.exe&#x547D;&#x4EE4;&#x8FD0;&#x884C;&#xFF09;&#xFF0C;&#x4E0D;&#x9700;&#x4EFB;&#x4F55;&#x5904;&#x7406;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x56E0;&#x4E3A;&#x9759;&#x6001;&#x7F16;&#x8BD1;&#xFF0C;&#x6240;&#x4EE5;&#x4E0D;&#x7528;&#x62C5;&#x5FC3;&#x5728;&#x7CFB;&#x7EDF;&#x5E93;&#x66F4;&#x65B0;&#x7684;&#x65F6;&#x5019;&#x51B2;&#x7A81;&#xFF0C;&#x5E78;&#x798F;&#x611F;&#x6EE1;&#x6EE1;&#xFF09;&#x3002;</p>
<pre><code>$ ./helloworld
Hello, &#x4E16;&#x754C;
</code></pre><p>&#x672C;&#x4E66;&#x4E2D;&#x6240;&#x6709;&#x793A;&#x4F8B;&#x4EE3;&#x7801;&#x4E0A;&#x90FD;&#x6709;&#x4E00;&#x884C;&#x6807;&#x8BB0;&#xFF0C;&#x5229;&#x7528;&#x8FD9;&#x4E9B;&#x6807;&#x8BB0;&#x53EF;&#x4EE5;&#x4ECE;<a href="http://gopl.io" target="_blank">gopl.io</a>&#x7F51;&#x7AD9;&#x4E0A;&#x672C;&#x4E66;&#x6E90;&#x7801;&#x4ED3;&#x5E93;&#x91CC;&#x83B7;&#x53D6;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code>gopl.io/ch1/helloworld
</code></pre><p>&#x6267;&#x884C; <code>go get gopl.io/ch1/helloworld</code> &#x547D;&#x4EE4;&#xFF0C;&#x5C31;&#x4F1A;&#x4ECE;&#x7F51;&#x4E0A;&#x83B7;&#x53D6;&#x4EE3;&#x7801;&#xFF0C;&#x5E76;&#x653E;&#x5230;&#x5BF9;&#x5E94;&#x76EE;&#x5F55;&#x4E2D;&#xFF08;&#x9700;&#x8981;&#x5148;&#x5B89;&#x88C5;Git&#x6216;Hg&#x4E4B;&#x7C7B;&#x7684;&#x7248;&#x672C;&#x7BA1;&#x7406;&#x5DE5;&#x5177;&#xFF0C;&#x5E76;&#x5C06;&#x5BF9;&#x5E94;&#x7684;&#x547D;&#x4EE4;&#x6DFB;&#x52A0;&#x5230;PATH&#x73AF;&#x5883;&#x53D8;&#x91CF;&#x4E2D;&#x3002;&#x5E8F;&#x8A00;&#x5DF2;&#x7ECF;&#x63D0;&#x53CA;&#xFF0C;&#x9700;&#x8981;&#x5148;&#x8BBE;&#x7F6E;&#x597D;GOPATH&#x73AF;&#x5883;&#x53D8;&#x91CF;&#xFF0C;&#x4E0B;&#x8F7D;&#x7684;&#x4EE3;&#x7801;&#x4F1A;&#x653E;&#x5728;<code>$GOPATH/src/gopl.io/ch1/helloworld</code>&#x76EE;&#x5F55;&#xFF09;&#x3002;2.6&#x548C;10.7&#x8282;&#x6709;&#x8FD9;&#x65B9;&#x9762;&#x66F4;&#x8BE6;&#x7EC6;&#x7684;&#x4ECB;&#x7ECD;&#x3002;</p>
<p>&#x6765;&#x8BA8;&#x8BBA;&#x4E0B;&#x7A0B;&#x5E8F;&#x672C;&#x8EAB;&#x3002;Go&#x8BED;&#x8A00;&#x7684;&#x4EE3;&#x7801;&#x901A;&#x8FC7;<strong>&#x5305;</strong>&#xFF08;package&#xFF09;&#x7EC4;&#x7EC7;&#xFF0C;&#x5305;&#x7C7B;&#x4F3C;&#x4E8E;&#x5176;&#x5B83;&#x8BED;&#x8A00;&#x91CC;&#x7684;&#x5E93;&#xFF08;libraries&#xFF09;&#x6216;&#x8005;&#x6A21;&#x5757;&#xFF08;modules&#xFF09;&#x3002;&#x4E00;&#x4E2A;&#x5305;&#x7531;&#x4F4D;&#x4E8E;&#x5355;&#x4E2A;&#x76EE;&#x5F55;&#x4E0B;&#x7684;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;.go&#x6E90;&#x4EE3;&#x7801;&#x6587;&#x4EF6;&#x7EC4;&#x6210;&#xFF0C;&#x76EE;&#x5F55;&#x5B9A;&#x4E49;&#x5305;&#x7684;&#x4F5C;&#x7528;&#x3002;&#x6BCF;&#x4E2A;&#x6E90;&#x6587;&#x4EF6;&#x90FD;&#x4EE5;&#x4E00;&#x6761;<code>package</code>&#x58F0;&#x660E;&#x8BED;&#x53E5;&#x5F00;&#x59CB;&#xFF0C;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x91CC;&#x5C31;&#x662F;<code>package main</code>&#xFF0C;&#x8868;&#x793A;&#x8BE5;&#x6587;&#x4EF6;&#x5C5E;&#x4E8E;&#x54EA;&#x4E2A;&#x5305;&#xFF0C;&#x7D27;&#x8DDF;&#x7740;&#x4E00;&#x7CFB;&#x5217;&#x5BFC;&#x5165;&#xFF08;import&#xFF09;&#x7684;&#x5305;&#xFF0C;&#x4E4B;&#x540E;&#x662F;&#x5B58;&#x50A8;&#x5728;&#x8FD9;&#x4E2A;&#x6587;&#x4EF6;&#x91CC;&#x7684;&#x7A0B;&#x5E8F;&#x8BED;&#x53E5;&#x3002;</p>
<p>Go&#x7684;&#x6807;&#x51C6;&#x5E93;&#x63D0;&#x4F9B;&#x4E86;100&#x591A;&#x4E2A;&#x5305;&#xFF0C;&#x4EE5;&#x652F;&#x6301;&#x5E38;&#x89C1;&#x529F;&#x80FD;&#xFF0C;&#x5982;&#x8F93;&#x5165;&#x3001;&#x8F93;&#x51FA;&#x3001;&#x6392;&#x5E8F;&#x4EE5;&#x53CA;&#x6587;&#x672C;&#x5904;&#x7406;&#x3002;&#x6BD4;&#x5982;<code>fmt</code>&#x5305;&#xFF0C;&#x5C31;&#x542B;&#x6709;&#x683C;&#x5F0F;&#x5316;&#x8F93;&#x51FA;&#x3001;&#x63A5;&#x6536;&#x8F93;&#x5165;&#x7684;&#x51FD;&#x6570;&#x3002;<code>Println</code>&#x662F;&#x5176;&#x4E2D;&#x4E00;&#x4E2A;&#x57FA;&#x7840;&#x51FD;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x6253;&#x5370;&#x4EE5;&#x7A7A;&#x683C;&#x95F4;&#x9694;&#x7684;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x503C;&#xFF0C;&#x5E76;&#x5728;&#x6700;&#x540E;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;&#x6362;&#x884C;&#x7B26;&#xFF0C;&#x4ECE;&#x800C;&#x8F93;&#x51FA;&#x4E00;&#x6574;&#x884C;&#x3002;</p>
<p><code>main</code>&#x5305;&#x6BD4;&#x8F83;&#x7279;&#x6B8A;&#x3002;&#x5B83;&#x5B9A;&#x4E49;&#x4E86;&#x4E00;&#x4E2A;&#x72EC;&#x7ACB;&#x53EF;&#x6267;&#x884C;&#x7684;&#x7A0B;&#x5E8F;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x4E00;&#x4E2A;&#x5E93;&#x3002;&#x5728;<code>main</code>&#x91CC;&#x7684;<code>main</code> <em>&#x51FD;&#x6570;</em> &#x4E5F;&#x5F88;&#x7279;&#x6B8A;&#xFF0C;&#x5B83;&#x662F;&#x6574;&#x4E2A;&#x7A0B;&#x5E8F;&#x6267;&#x884C;&#x65F6;&#x7684;&#x5165;&#x53E3;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;C&#x7CFB;&#x8BED;&#x8A00;&#x5DEE;&#x4E0D;&#x591A;&#x90FD;&#x8FD9;&#x6837;&#xFF09;&#x3002;<code>main</code>&#x51FD;&#x6570;&#x6240;&#x505A;&#x7684;&#x4E8B;&#x60C5;&#x5C31;&#x662F;&#x7A0B;&#x5E8F;&#x505A;&#x7684;&#x3002;&#x5F53;&#x7136;&#x4E86;&#xFF0C;<code>main</code>&#x51FD;&#x6570;&#x4E00;&#x822C;&#x8C03;&#x7528;&#x5176;&#x5B83;&#x5305;&#x91CC;&#x7684;&#x51FD;&#x6570;&#x5B8C;&#x6210;&#x5F88;&#x591A;&#x5DE5;&#x4F5C;&#xFF08;&#x5982;&#xFF1A;<code>fmt.Println</code>&#xFF09;&#x3002;</p>
<p>&#x5FC5;&#x987B;&#x544A;&#x8BC9;&#x7F16;&#x8BD1;&#x5668;&#x6E90;&#x6587;&#x4EF6;&#x9700;&#x8981;&#x54EA;&#x4E9B;&#x5305;&#xFF0C;&#x8FD9;&#x5C31;&#x662F;&#x8DDF;&#x968F;&#x5728;<code>package</code>&#x58F0;&#x660E;&#x540E;&#x9762;&#x7684;<code>import</code>&#x58F0;&#x660E;&#x626E;&#x6F14;&#x7684;&#x89D2;&#x8272;&#x3002;hello world&#x4F8B;&#x5B50;&#x53EA;&#x7528;&#x5230;&#x4E86;&#x4E00;&#x4E2A;&#x5305;&#xFF0C;&#x5927;&#x591A;&#x6570;&#x7A0B;&#x5E8F;&#x9700;&#x8981;&#x5BFC;&#x5165;&#x591A;&#x4E2A;&#x5305;&#x3002;</p>
<p>&#x5FC5;&#x987B;&#x6070;&#x5F53;&#x5BFC;&#x5165;&#x9700;&#x8981;&#x7684;&#x5305;&#xFF0C;&#x7F3A;&#x5C11;&#x4E86;&#x5FC5;&#x8981;&#x7684;&#x5305;&#x6216;&#x8005;&#x5BFC;&#x5165;&#x4E86;&#x4E0D;&#x9700;&#x8981;&#x7684;&#x5305;&#xFF0C;&#x7A0B;&#x5E8F;&#x90FD;&#x65E0;&#x6CD5;&#x7F16;&#x8BD1;&#x901A;&#x8FC7;&#x3002;&#x8FD9;&#x9879;&#x4E25;&#x683C;&#x8981;&#x6C42;&#x907F;&#x514D;&#x4E86;&#x7A0B;&#x5E8F;&#x5F00;&#x53D1;&#x8FC7;&#x7A0B;&#x4E2D;&#x5F15;&#x5165;&#x672A;&#x4F7F;&#x7528;&#x7684;&#x5305;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;Go&#x8BED;&#x8A00;&#x7F16;&#x8BD1;&#x8FC7;&#x7A0B;&#x6CA1;&#x6709;&#x8B66;&#x544A;&#x4FE1;&#x606F;&#xFF0C;&#x4E89;&#x8BAE;&#x7279;&#x6027;&#x4E4B;&#x4E00;&#xFF09;&#x3002;</p>
<p><code>import</code>&#x58F0;&#x660E;&#x5FC5;&#x987B;&#x8DDF;&#x5728;&#x6587;&#x4EF6;&#x7684;<code>package</code>&#x58F0;&#x660E;&#x4E4B;&#x540E;&#x3002;&#x968F;&#x540E;&#xFF0C;&#x5219;&#x662F;&#x7EC4;&#x6210;&#x7A0B;&#x5E8F;&#x7684;&#x51FD;&#x6570;&#x3001;&#x53D8;&#x91CF;&#x3001;&#x5E38;&#x91CF;&#x3001;&#x7C7B;&#x578B;&#x7684;&#x58F0;&#x660E;&#x8BED;&#x53E5;&#xFF08;&#x5206;&#x522B;&#x7531;&#x5173;&#x952E;&#x5B57;<code>func</code>&#x3001;<code>var</code>&#x3001;<code>const</code>&#x3001;<code>type</code>&#x5B9A;&#x4E49;&#xFF09;&#x3002;&#x8FD9;&#x4E9B;&#x5185;&#x5BB9;&#x7684;&#x58F0;&#x660E;&#x987A;&#x5E8F;&#x5E76;&#x4E0D;&#x91CD;&#x8981;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x6700;&#x597D;&#x8FD8;&#x662F;&#x5B9A;&#x4E00;&#x4E0B;&#x89C4;&#x8303;&#xFF09;&#x3002;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x7684;&#x7A0B;&#x5E8F;&#x5DF2;&#x7ECF;&#x5C3D;&#x53EF;&#x80FD;&#x77ED;&#x4E86;&#xFF0C;&#x53EA;&#x58F0;&#x660E;&#x4E86;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x5176;&#x4E2D;&#x53EA;&#x8C03;&#x7528;&#x4E86;&#x4E00;&#x4E2A;&#x5176;&#x4ED6;&#x51FD;&#x6570;&#x3002;&#x4E3A;&#x4E86;&#x8282;&#x7701;&#x7BC7;&#x5E45;&#xFF0C;&#x6709;&#x4E9B;&#x65F6;&#x5019;&#x793A;&#x4F8B;&#x7A0B;&#x5E8F;&#x4F1A;&#x7701;&#x7565;<code>package</code>&#x548C;<code>import</code>&#x58F0;&#x660E;&#xFF0C;&#x4F46;&#x662F;&#xFF0C;&#x8FD9;&#x4E9B;&#x58F0;&#x660E;&#x5728;&#x6E90;&#x4EE3;&#x7801;&#x91CC;&#x6709;&#xFF0C;&#x5E76;&#x4E14;&#x5FC5;&#x987B;&#x5F97;&#x6709;&#x624D;&#x80FD;&#x7F16;&#x8BD1;&#x3002;</p>
<p>&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x7684;&#x58F0;&#x660E;&#x7531;<code>func</code>&#x5173;&#x952E;&#x5B57;&#x3001;&#x51FD;&#x6570;&#x540D;&#x3001;&#x53C2;&#x6570;&#x5217;&#x8868;&#x3001;&#x8FD4;&#x56DE;&#x503C;&#x5217;&#x8868;&#xFF08;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x91CC;&#x7684;<code>main</code>&#x51FD;&#x6570;&#x53C2;&#x6570;&#x5217;&#x8868;&#x548C;&#x8FD4;&#x56DE;&#x503C;&#x90FD;&#x662F;&#x7A7A;&#x7684;&#xFF09;&#x4EE5;&#x53CA;&#x5305;&#x542B;&#x5728;&#x5927;&#x62EC;&#x53F7;&#x91CC;&#x7684;&#x51FD;&#x6570;&#x4F53;&#x7EC4;&#x6210;&#x3002;&#x7B2C;&#x4E94;&#x7AE0;&#x8FDB;&#x4E00;&#x6B65;&#x8003;&#x5BDF;&#x51FD;&#x6570;&#x3002;</p>
<p>Go&#x8BED;&#x8A00;&#x4E0D;&#x9700;&#x8981;&#x5728;&#x8BED;&#x53E5;&#x6216;&#x8005;&#x58F0;&#x660E;&#x7684;&#x672B;&#x5C3E;&#x6DFB;&#x52A0;&#x5206;&#x53F7;&#xFF0C;&#x9664;&#x975E;&#x4E00;&#x884C;&#x4E0A;&#x6709;&#x591A;&#x6761;&#x8BED;&#x53E5;&#x3002;&#x5B9E;&#x9645;&#x4E0A;&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x4F1A;&#x4E3B;&#x52A8;&#x628A;&#x7279;&#x5B9A;&#x7B26;&#x53F7;&#x540E;&#x7684;&#x6362;&#x884C;&#x7B26;&#x8F6C;&#x6362;&#x4E3A;&#x5206;&#x53F7;&#xFF0C;&#x56E0;&#x6B64;&#x6362;&#x884C;&#x7B26;&#x6DFB;&#x52A0;&#x7684;&#x4F4D;&#x7F6E;&#x4F1A;&#x5F71;&#x54CD;Go&#x4EE3;&#x7801;&#x7684;&#x6B63;&#x786E;&#x89E3;&#x6790;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x6BD4;&#x5982;&#x884C;&#x672B;&#x662F;&#x6807;&#x8BC6;&#x7B26;&#x3001;&#x6574;&#x6570;&#x3001;&#x6D6E;&#x70B9;&#x6570;&#x3001;&#x865A;&#x6570;&#x3001;&#x5B57;&#x7B26;&#x6216;&#x5B57;&#x7B26;&#x4E32;&#x6587;&#x5B57;&#x3001;&#x5173;&#x952E;&#x5B57;<code>break</code>&#x3001;<code>continue</code>&#x3001;<code>fallthrough</code>&#x6216;<code>return</code>&#x4E2D;&#x7684;&#x4E00;&#x4E2A;&#x3001;&#x8FD0;&#x7B97;&#x7B26;&#x548C;&#x5206;&#x9694;&#x7B26;<code>++</code>&#x3001;<code>--</code>&#x3001;<code>)</code>&#x3001;<code>]</code>&#x6216;<code>}</code>&#x4E2D;&#x7684;&#x4E00;&#x4E2A;&#xFF09;&#x3002;&#x4E3E;&#x4E2A;&#x4F8B;&#x5B50;&#xFF0C;&#x51FD;&#x6570;&#x7684;&#x5DE6;&#x62EC;&#x53F7;<code>{</code>&#x5FC5;&#x987B;&#x548C;<code>func</code>&#x51FD;&#x6570;&#x58F0;&#x660E;&#x5728;&#x540C;&#x4E00;&#x884C;&#x4E0A;&#xFF0C;&#x4E14;&#x4F4D;&#x4E8E;&#x672B;&#x5C3E;&#xFF0C;&#x4E0D;&#x80FD;&#x72EC;&#x5360;&#x4E00;&#x884C;&#xFF0C;&#x800C;&#x5728;&#x8868;&#x8FBE;&#x5F0F;<code>x + y</code>&#x4E2D;&#xFF0C;&#x53EF;&#x5728;<code>+</code>&#x540E;&#x6362;&#x884C;&#xFF0C;&#x4E0D;&#x80FD;&#x5728;<code>+</code>&#x524D;&#x6362;&#x884C;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x4EE5;+&#x7ED3;&#x5C3E;&#x7684;&#x8BDD;&#x4E0D;&#x4F1A;&#x88AB;&#x63D2;&#x5165;&#x5206;&#x53F7;&#x5206;&#x9694;&#x7B26;&#xFF0C;&#x4F46;&#x662F;&#x4EE5;x&#x7ED3;&#x5C3E;&#x7684;&#x8BDD;&#x5219;&#x4F1A;&#x88AB;&#x5206;&#x53F7;&#x5206;&#x9694;&#x7B26;&#xFF0C;&#x4ECE;&#x800C;&#x5BFC;&#x81F4;&#x7F16;&#x8BD1;&#x9519;&#x8BEF;&#xFF09;&#x3002;</p>
<p>Go&#x8BED;&#x8A00;&#x5728;&#x4EE3;&#x7801;&#x683C;&#x5F0F;&#x4E0A;&#x91C7;&#x53D6;&#x4E86;&#x5F88;&#x5F3A;&#x786C;&#x7684;&#x6001;&#x5EA6;&#x3002;<code>gofmt</code>&#x5DE5;&#x5177;&#x628A;&#x4EE3;&#x7801;&#x683C;&#x5F0F;&#x5316;&#x4E3A;&#x6807;&#x51C6;&#x683C;&#x5F0F;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x8FD9;&#x4E2A;&#x683C;&#x5F0F;&#x5316;&#x5DE5;&#x5177;&#x6CA1;&#x6709;&#x4EFB;&#x4F55;&#x53EF;&#x4EE5;&#x8C03;&#x6574;&#x4EE3;&#x7801;&#x683C;&#x5F0F;&#x7684;&#x53C2;&#x6570;&#xFF0C;Go&#x8BED;&#x8A00;&#x5C31;&#x662F;&#x8FD9;&#x4E48;&#x4EFB;&#x6027;&#xFF09;&#xFF0C;&#x5E76;&#x4E14;<code>go</code>&#x5DE5;&#x5177;&#x4E2D;&#x7684;<code>fmt</code>&#x5B50;&#x547D;&#x4EE4;&#x4F1A;&#x5BF9;&#x6307;&#x5B9A;&#x5305;&#xFF0C;&#x5426;&#x5219;&#x9ED8;&#x8BA4;&#x4E3A;&#x5F53;&#x524D;&#x76EE;&#x5F55;&#x4E2D;&#x6240;&#x6709;.go&#x6E90;&#x6587;&#x4EF6;&#x5E94;&#x7528;<code>gofmt</code>&#x547D;&#x4EE4;&#x3002;&#x672C;&#x4E66;&#x4E2D;&#x7684;&#x6240;&#x6709;&#x4EE3;&#x7801;&#x90FD;&#x88AB;gofmt&#x8FC7;&#x3002;&#x4F60;&#x4E5F;&#x5E94;&#x8BE5;&#x517B;&#x6210;&#x683C;&#x5F0F;&#x5316;&#x81EA;&#x5DF1;&#x7684;&#x4EE3;&#x7801;&#x7684;&#x4E60;&#x60EF;&#x3002;&#x4EE5;&#x6CD5;&#x4EE4;&#x65B9;&#x5F0F;&#x89C4;&#x5B9A;&#x6807;&#x51C6;&#x7684;&#x4EE3;&#x7801;&#x683C;&#x5F0F;&#x53EF;&#x4EE5;&#x907F;&#x514D;&#x65E0;&#x5C3D;&#x7684;&#x65E0;&#x610F;&#x4E49;&#x7684;&#x7410;&#x788E;&#x4E89;&#x6267;&#xFF08;&#x8BD1;&#x6CE8;&#xFF1A;&#x4E5F;&#x5BFC;&#x81F4;&#x4E86;Go&#x8BED;&#x8A00;&#x7684;TIOBE&#x6392;&#x540D;&#x8F83;&#x4F4E;&#xFF0C;&#x56E0;&#x4E3A;&#x7F3A;&#x5C11;&#x6495;&#x903C;&#x7684;&#x8BDD;&#x9898;&#xFF09;&#x3002;&#x66F4;&#x91CD;&#x8981;&#x7684;&#x662F;&#xFF0C;&#x8FD9;&#x6837;&#x53EF;&#x4EE5;&#x505A;&#x591A;&#x79CD;&#x81EA;&#x52A8;&#x6E90;&#x7801;&#x8F6C;&#x6362;&#xFF0C;&#x5982;&#x679C;&#x653E;&#x4EFB;Go&#x8BED;&#x8A00;&#x4EE3;&#x7801;&#x683C;&#x5F0F;&#xFF0C;&#x8FD9;&#x4E9B;&#x8F6C;&#x6362;&#x5C31;&#x4E0D;&#x5927;&#x53EF;&#x80FD;&#x4E86;&#x3002;</p>
<p>&#x5F88;&#x591A;&#x6587;&#x672C;&#x7F16;&#x8F91;&#x5668;&#x90FD;&#x53EF;&#x4EE5;&#x914D;&#x7F6E;&#x4E3A;&#x4FDD;&#x5B58;&#x6587;&#x4EF6;&#x65F6;&#x81EA;&#x52A8;&#x6267;&#x884C;<code>gofmt</code>&#xFF0C;&#x8FD9;&#x6837;&#x4F60;&#x7684;&#x6E90;&#x4EE3;&#x7801;&#x603B;&#x4F1A;&#x88AB;&#x6070;&#x5F53;&#x5730;&#x683C;&#x5F0F;&#x5316;&#x3002;&#x8FD8;&#x6709;&#x4E2A;&#x76F8;&#x5173;&#x7684;&#x5DE5;&#x5177;&#xFF0C;<code>goimports</code>&#xFF0C;&#x53EF;&#x4EE5;&#x6839;&#x636E;&#x4EE3;&#x7801;&#x9700;&#x8981;&#xFF0C;&#x81EA;&#x52A8;&#x5730;&#x6DFB;&#x52A0;&#x6216;&#x5220;&#x9664;<code>import</code>&#x58F0;&#x660E;&#x3002;&#x8FD9;&#x4E2A;&#x5DE5;&#x5177;&#x5E76;&#x6CA1;&#x6709;&#x5305;&#x542B;&#x5728;&#x6807;&#x51C6;&#x7684;&#x5206;&#x53D1;&#x5305;&#x4E2D;&#xFF0C;&#x53EF;&#x4EE5;&#x7528;&#x4E0B;&#x9762;&#x7684;&#x547D;&#x4EE4;&#x5B89;&#x88C5;&#xFF1A;</p>
<pre><code>$ go get golang.org/x/tools/cmd/goimports
</code></pre><p>&#x5BF9;&#x4E8E;&#x5927;&#x591A;&#x6570;&#x7528;&#x6237;&#x6765;&#x8BF4;&#xFF0C;&#x4E0B;&#x8F7D;&#x3001;&#x7F16;&#x8BD1;&#x5305;&#x3001;&#x8FD0;&#x884C;&#x6D4B;&#x8BD5;&#x7528;&#x4F8B;&#x3001;&#x5BDF;&#x770B;Go&#x8BED;&#x8A00;&#x7684;&#x6587;&#x6863;&#x7B49;&#x7B49;&#x5E38;&#x7528;&#x529F;&#x80FD;&#x90FD;&#x53EF;&#x4EE5;&#x7528;go&#x7684;&#x5DE5;&#x5177;&#x5B8C;&#x6210;&#x3002;10.7&#x8282;&#x8BE6;&#x7EC6;&#x4ECB;&#x7ECD;&#x8FD9;&#x4E9B;&#x77E5;&#x8BC6;&#x3002;</p>

                                
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